In the distant past, a war between humans and demons brought about widespread chaos and bloodshed. To put an end to this seemingly endless conflict, Demon King Anos Voldigoad willingly sacrificed his life, hoping to be reborn in a peaceful future. In preparation for their king's return, the demon race created the Demon King Academy, an elite institution tasked with determining Anos' identity when he reawakens. He reincarnates two millennia later, but to his surprise, he soon learns that the level of magic in the world has drastically waned during his absence. Moreover, when he enrolls at the academy to reclaim his rightful title, he finds out that demonkind remembers him differently. His personality, his deeds, and even his legacy are all falsified—masked beneath the name of an impostor. This "lack" of common knowledge renders him the academy's outlier—a misfit never before seen in history. Despite these drawbacks, Anos remains unfazed. As he sets out to uncover those altering his glorious past, he takes it upon himself to make his descendants recognize that their ruler has finally returned. [Written by MAL Rewrite]

Two OVAs released with the 8th and 10th volumes of the original novel. They fall chronologically between the first and second seasons.

Kimagure Orange Road OVA is basically the extension from the TV series. The time frame is probably in the middle of the TV series. Order to view with the TV series. White Lovers - among the episodes 35 and 45 Hawai Suspence - among the episodes 17 and 25 I was a cat, I was a fish - among the episodes 17 and 30 Hurricane Akane, the shape-shifting girl - among the episodes 20 and 25 Spring is for Idols - among the episodes 23 and 30 Birth of a Star - Right after "Spring is for Idols" Unexpected Situation - after the OAV of Akane Message in Rouge - after the episode 48

The story takes place in the second half of the 19th century, as Japanese culture gains popularity in the West. A young Japanese girl, Yune, accompanies a French traveler, Oscar, on his journey back to France, and offers to help at the family's ironwork shop in Paris. Oscar's nephew and shop-owner Claude reluctantly accepts to take care of Yune, and we learn how those two, who have so little in common, get to understand each other and live together in the Paris of the 1800s.